Supported by the Grants from the Agricultural Science and Technology Achievements Transformation Fund 2013GB2E000368,by the Science and Technology Department of Guangdong Province 2012B020308008 and by the Science and Technology Department of Shantou 67科技部农业科技成果转化资金2013GB2E000368;广东省科技计划2012B020308008;汕头市科技计划67